Mesh-Pull Backup Parent Pools for Video-On-Demand Multicast Trees

Resilient multicast is a challenging issue for overlay trees particularly because of high churn. In this work, we propose a mechanism that allows scalable video multicast. While the regular operation involves tree-push of the video, any node that looses its parent on the tree solicits video from a predetermined backup set of nodes in a mesh-pull fashion. The main idea is to allocate less bandwidth for backup to improve bandwidth utilization while maintaining the best possible video quality. The choice of essential design parameters are studied together with seamlessness of the streaming under variety of fault scenarios. Simulation results indicate the optimality of the proposed approach as far as resiliency, bandwidth utilization, delay and video quality are concerned.